The son of a weaver, Feigl was born in Reichenberg (Liberec), Bohemia, and matriculated at the University of Vienna in 1922. He studied physics and philosophy under Moritz Schlick, the founder of the Vienna Circle, and received his doctorate in 1927 for the essay "Chance and Law: An Epistemological Analysis of the Roles of Probability and Induction in the Natural Sciences." He published his first book, Theory and Experience in Physics, in 1929. During this time,[1] became an active member in the Vienna Circle. He was one of the few Circle members (along with Schlick and Friedrich Waismann) to have extensive conversations with Ludwig Wittgenstein and Karl Popper.